The Magnetic Light Mine is a small (approximately 40 mm across) plastic
ball with 12 individual magnets placed around the surface.

It weighs 22 grams (3/4 oz.). The magnets hold the ball on a piece of
ferrous metal and a single LED light can be engaged to provide a minimal
amount of light for emergency use.

The Magnetic Light Mine is more of a novelty or curiosity than anything
else, in my opinion. The magnets don't seem very powerful and their orientation
means that they don't sit flush to the surface of the item that the Light
Mine is attached to. It doesn't stick very well to tubular frames either,
especially if they have a thick powder coat, like the Ducati.

The single LED light isn't very powerful; it's sort of like one of those
keychain LEDs. Just enough light to get the key into the hole, but not much
more than that. I tried it in several orientations on the bike at night,
and I suppose it's handy in that it can allow a hands-free evolution, but
I'd rather spend the 7 bucks on something like a
Gordon LED flashlight
(review), still one of the best LED bargains around.